Jack



S. A. SNELL Apr. 24, 1923.

' JACK Filed Dec. 24 1921 2 Sheets-Sheet l III "i structure.

vation.

Patented Apr. 24, 1923.

- LIN-irenstares PLATEN-t sAMiIELA-.Siieta-r .sr-Loilslwissoiist .ASSIGNOR TOQMQON Be'OTI-IERS, MeNUf FACTUMNGCOMPANY, ors'r. Lou/is, ,iviti'ssounn'Y A oonroael'rionor iifiis'soiri2.i'.M4

` JACK,

Application. filed December 24, 1921. Serial No. 524,614.

To all who/)nit may concern Be it known that I, SAMUEL A. SNnLn, a

.subject ot' theKing oi" Great Britaiinre-v sidingat the city of St. Louis and State `of Missouri, have inventeda certain new and useful Improvement in Jacks, of which the `following is a full, clear, and exact.

description, such as` will enable others skilled in the art to which itapperta-ins to malte and use zthe same, yreference bei-ng`1 had 'to the accompanying drawings, forming part of thisapplication.

My invention' relates vto jacks and colmprises an improved base, column, operating '.lmechaiiisiii, and housing" for saine.

One object of my` invention is to` produce aneconomical eflicient training by utilizing pressed metal parte which @are adapted tot be assembled iv'itli'each 'other withgmini` j mumk labor to produce completed Another object of my invention isto piro` vide a mechanism which willV positive Lin actioin'either in raisingor' loiifering.

Anf additionall object., of my .invention is j to permitA quick movementfot' the jacly bar upto va loadand downfrom a load although l requiring ,a tooth by tooth niovenientwhen loaded whether Ibeing lraised* or lowered.

rIn the accompanyingy drawings, which J illustratel ak selected' embodiment of lmy infl AFigure. Lis a side elevation ofgmy improved jack. l

Figre 2 is4 an enlarged 'detail showingv a portion of the. upright: colunin, operating ineclianism housingv yfand operatingv handle in Vertical section', and showing the saddle rack land operating mechanism inside ele- Figure 3 is a fragmentarydetail similar toFigure 2, ,ut showing the mechanism in a different operating position.

i FigurefisP a frontr elevationl ofthe finger L by which t'hejack is A,set yto raisepor lower.

umn and" mechanisinhousing. j FigureG is a top view of the saine.

Figfr'e 7 horizontal section on line` Figure 5 a front elevation otfthe col'- `Figuren8` 'is an isometric view. of the column. y* j `v`Figure 9is a transverse i-*ertical section' O'hf 111.1595-91 .O1-Tirelire l and Shawna 'a modified assembly @t the base and" @we Figure 10 is a bottom view of the base of vthe j ack.y

Figure 11 is an end View of the column before completion. The 4basel is a dish-shaped metal stamping., the perimeter of which is hanged downward-at 2 and the central portion of which is flanged upward at 3 andprovided with angular notches 4L arranged as shown' in Figure l0. Stiifening ribs 6 extend diagonally from each Vcorner of' the baseto the adjacent corner of the rib 3. The Vertical' knotches 4c of the base, extending'downwardlyr therefrom and'ther'e riveted'overthe bottlom`` of the'base. l y In' the modilied assembly shown in F igure 9, a rectangular opening i's formed in base 1, producing a blank l2 which I utilize to lbrace the lower end yof the column by trimming the' blank so that its outside dimensions correspond to the inside dimensions'` 'ofthe' col`V umn. 'Thisb'lanlis'then inserted in the end of the column,"and the base, 'column and` blank are then weldedtogethen'the blank providing' vthe necessary metal" to back 't-liek relatively'thi-n sectionpres'ent7 in the column L at the Yiivelding, point.A j

' e "i1 the upper end of the column, one side s slotted at 13 rfor the reception of operating pawlsfas shown in Figures 2l and 3.

Theoperatiiigmechanism housing ispreferably formed of a yflat^plate b'eii't into aA deep U-section which tightlyembracescoliunn'57 'on three sidesand 'entends outwardly from the fourth side of thefla'tter a substan-y tialdi'stanc'e. 1`"The vertical-A side 'of housing l5 arebraced by plates 16 and 17 which 'may be riveted toY the "housing yby; integral rivets 18 formed on'A the latter," Due to the tight grippingiof the column by the"- housing, -single fastening2'meansjconnectl,

ing these two members is all that is required to maintain their assembly. Figure l indicates a screw 19 and a spot weld 2() as the securing means, but it is to be understood that only one of these means is necessary. It' screw i9 alone is used the column and housing` may be disassembled, while the spot weld 2() provides a permanent assembly.

A. handle lever 2l is preferably oi' rectan gular section similar to column 7', but the lower end of same resembles a U-shape which faces upwardly and receives operating pawls 22 and 23 which engage the teeth ot the saddle rack 20. `Fawls 22 and 23 are pivoted on the lever by means ol" pins 2Liand 25, respectively. Pin 2i extends through. pawl 22, the sides of handle 2l and the sides oit housing l5, being headed. at one end and provided with a Cotter 26 at the opposite end. Pin 25 extends through pawl and the sides ot handle 2l., its ends abutting against the sides oit' housing l5. lVhen the operating handle 2l is raised and lowered, a pin 27 extending transversely through the handle engages the edges ot the side walls ot housing l5 adjacent to the open side of the latter. This engagement positively limits the movements of the handle, relieving the pawls and other parts ot the housing` from the possibility or' being' forced into abnormal position or unduly strained by the leverage exerted at the forward end of the handle. f

Mounted on the front of column 7 is a bracket 28 which forms a seat and housing for a coil spring 29, the upper end ot which yieldingly supports a plunger 30. Plunger 30 is connected to an eccentric finger 31 below bracket 28 which is adapted to be moved from the dotted line position shown in Figure t to the full line position there indicated to withdraw the plunger from the projected position shown in Figures 2 and 3. Pawls 22 and 23 are 1arovided with downwardly exn tending lugs 32 and 33 terminating just above plunger 30. l /Vhen the plunger is re leased, as shown in Figures 2 and 3, it pushes upwardly against one or the other or both of these lugs according to theposition ot the operating handle and the operation ot the jack is as will be explained later. Pawls 22 and 23 are provided with individual springs 34 and 35, respectively, each ot which pushes its respective pawl inwardly toward a ratchet bar 36 of the usual construction. These springs are not strong enough to function as described, when plunger 30 is released and spring 29 is pressing the same upwardly, as shown in Figures 2 and 3.

When the eccentric linger 3l is in the full line position shown in Figure 4, and plunger 30 is fully withdrawn from possible contact with the lugs on the plugs, the jack may be operated to litt a load in the usual its superimposed load, eccentric 3l is turned to the position shown in Figure 5. lVith the operating` handle in the position shown in Figure 2, plunger 30 engages the lug 33 on pawl 23, thrusting the pawl out ot engagement with the ratchet against the opposing tendency ot spring 35. is the handle is lowered, pawl 23 and plunger 30 rise and plunger 30 engages projection 32 on pawl 22. Due to the fact that the load is supported at this time by pawl 22, the pawl will be held immovable and the upward movement of plunger 30 will be halted. Pawl 23, however, continues to rise and being released from plunger 30 will engage rack 36 and lift same enough to tree pawl 22 which immediately moves out of engagement with the rack impelled thereto by plunger 30. Upward movement ot the handle will now lower pawl 23 and the load supported thereby and as lug 33 on pawl 23 descends, it will engage plunger 30 forcing the same downwardly, thereby disengaging lug 32 on pawl 22 and permittingI the latter impelled by spring` 34 to move back into engagement with ratchet bar 36.

This operation may be continued until the jack is released from its load. When this happens, upon further movement of the handle, plunger 30 will engage both lugs and throw out both pawls, as shown in Figure 3. It will be understood that spring 29 is strong enough to overcome not only the combined action ot springs 34 and 35, but also the friction on the point of pawl 22 due to the net weight of ratchet bar 36. This disengagement of the ratchet bar by both pawls enables the bar to drop to its lowest position, but eliminates tooth by tooth lowering of the bar as is usually necessary in ratchet jacks. Pawls 22 and 23, bracket 28, plunger 30, and finger 3l are stamped from sheet metal and as my jack is formed throughout almost en'tirely of metal pressings, it is very light for its capacity without any sacrifice of rigidity and strength.

The construction shown eliminates a number of small parts and manufacturing operations and results, in large production, in substantial economies.

I contemplate the usual modications in the commercial development of my invention, without departing from the spirit thereof as expressed in the appended claims.

I claim lar slots of restricted area in its upper face, and a tubular column, the lowerend of which is provided with vertical notches seated on the metal between the base slots', the projections between the column notches 'being angular and extending into the base slots. p p

2. In a jack, a base comprising a metal kpressing in the shape of a rectangular inverted dish having centrally positioned angular openings adapted to receive and retain a rectangular column and provided with a stil'ening flange surrounding the angular openings, and diagonal bosses extend.-

ing from each corner thereof-to each corner of the base.

3; In a jack, a vertical body member comprising a'metal plate'bent yto iorm a hollow rectangular column, a rectangular housing for the jack operating mechanism comprising a metal plate surrounding said column and gripping three sides thereof extending laterally from the fourth side and there braced transversely at top and bottom, and

an operating handle fulcrumed between the l sides of said housing and extending outward ilrom the fourth side of said column through said housing. p

4. In a jack, a pressed metal base having an opening in its upper face, a pressed metal column seated in Said base and extending into said opening, a ratchet bar slidable therein,y a pressed metal housing surrounding said column and closely itting three sides thereof, a single fastening element securing said housingkin place on said column, and mechanism mounted in said housing and extending through the side of said column to operatively engage said rack.

5. In a jack, an upright body member, a ratchet bar slidable therein, ank open-sided housing secured to said member and extend- 1f. In a Jack, a base provided with anguing late-rally 'from one side thereof, anhandle inserted through the open side of said housing, ratchetv bar opening` mechanism mounted on said handle and a removable pin pivotally assembling said handle and the mechanism carriedthereby with said housing, said handle and mechanism being removable as a unit through the open side of said housing.

,6. Ina jack, a rectangular housing, a U# shaped handle extending therein with its sides bearing against the sides of the housing, an operating pawl inserted in said handle, a fulcrum. pin extending througl'r said pawl, handle and housing and removably secured to the latter,` a second pawl 1nserted inv said handle, a pivot pin extending through said second pawl and said handle and retained therein by the sides of said housing, said handle, pawls and pivot pin being removable as a unit through said hopsing. f.

umn and a mechanism housing extending outwardly therefrom and having an'opening on the side farthest from said column, an operating lever extending into said hous` ing through said opening,-and projections on the side oi? said lever adapted to engage the edges oi' the housing walls adjacentV to its open side to limit the movement of the lever. y v

8. In a ack, a pairof channel-shaped piv-` oted pawls having their channels facing InV testimony whereof I hereunto aiiix my signature this '19th day of December, 1921.

SAMUEL A. sNELL.

ii.v In a jack, a standard comprising a col- 

